California’s effort to ensure that the state receives low carbon electricity could end up increasing greenhouse gas emissions elsewhere in the country, thanks to a practice known as contract reshuffling.Importing low-carbon electricity from out-of-state suppliers of renewable sources such as solar, wind, geothermal and hydropower is one way California’s electric utilities can decrease their carbon emissions.

Environmental and community groups are looking for ways to replace the $500 million for energy conservation, transportation and other green programs that Gov. Jerry Brown persuaded the Legislature in mid-June to borrow to balance the state budget.

Gov. Jerry Brown’s effort to divert $500 million earmarked for environmental initiatives into the general fund would hurt California communities with high pollution levels and slow down efforts to spur efficiency, mass transit and alternative energy, critics told legislators this week. The state’s environmental officials have been developing programs to fund a range of programs in communities disadvantaged by environmental burdens. The money comes from auctions of greenhouse gas permits from the state’s new cap-and-trade pollution control marketplace.

Gov. Jerry Brown’s effort to divert $500 million earmarked for environmental initiatives into the general fund would hurt California communities with high pollution levels and slow down efforts to spur efficiency, mass transit and alternative energy, critics told legislators this week.

The state’s environmental officials have been developing programs to fund a range of programs in communities disadvantaged by environmental burdens. The money comes from auctions of greenhouse gas permits from the state’s new cap-and-trade pollution control marketplace.

As drivers speed along Highway 1, past the Richmond District and into the Presidio, they might only catch a quick glimpse of Mountain Lake off to the east. But anyone who takes a stroll down to this small body of water, tucked away behind a playground and tennis court, will see one of the city’s only remaining natural lakes – and one of its oldest.

If you think of Recology as a set of blue, green and black bins that hang out in the alley of your house that you roll out to the curb weekly — you have no idea. Over the last 10 years, what San Franciscans have been thinking of “garbage collection” has been transformed into something vastly different and much more industrial. Last month the 91-year-old worker-owned company announced that 80 percent of what San Franciscans put in the bins is going somewhere other than the landfill, a vast improvement on the 34 percent national average. The 650 tons a day of recyclables hauled by Recology is divided up almost entirely by hand, by a vast army of sorters.

At 10 a.m. Wednesday, California’s potentially revolutionary carbon cap-and-trade program launched in a humdrum fashion. Numbers began appearing on a secure Web site accessible to the biggest oil exploration companies, manufacturers, utilities, state regulators and independent monitors. No one outside of this select group got to see its inner workings. But the event marked a new phase in the state’s pioneering effort to halt climate change: actual dollars traded for permits to emit carbon dioxide.

Proposition 37, the state ballot measure requiring labels on genetically modified food, has revived a long-simmering debate about whether genetically modified food harms human health or the environment. But it’s the claim by opponents that food prices would increase that is riling proponents.

Scientists have devised an intricate network of carbon dioxide sensors in the Bay Area that could offer objective measurements to evaluate which climate change initiatives are effective in reducing greenhouse gases in the atmosphere. The sensors provide real-time local data on how much carbon dioxide is being emitted, said lead researcher Ronald Cohen, a professor of chemistry and of earth and planetary sciences at the University of California, Berkeley.